Yes, all true. The risk of being sued is not very well correlated with the likelihood of losing the case.the risk of a personal opinion being declared "defamation" when using a public platform is very real.
all I know is that in my job I am asked to review any cimpetitve claim with legal. no matter how evident publicly available information is.
I think the comparison to news and public figures is also tricky because there are different rules for politicians and defamation (very high bar in the US) and news (is supposed to) avoid personal opinion, while reviews can be almost 100% personal opinion.